Figure 4.

First-principles calculations of Bi-terminated surface state of YPtBi. Electronic band structure of YPtBi along the M–$\mathrm{\Gamma }$–M direction (a) with inclusion of spin-orbit coupling (SOC) and (b) without inclusion of SOC. The red highlight indicates the surface states. The red dots represent the presence of the surface state (Bi atoms at the surface in the slab geometry). The size of red dots shows how much the surface atom is contained in each eigenstate in the band structure. In other words, the larger red circle indicates the more surface atom character contained in the given quasiparticle state.